Sequences and series

Asmall business produces and sells balls. the fixed costs are $20 and each ball costs $4.32 to produce. each ball sells for $8.32. write the equations for the total cost, c, and the revenue, r, then use the graphing method to determine how many balls must be sold to break even.

1.based of the diagrams what is the the value of x? 2.how would you verify your answer for x

What are the excluded values? m+5/mn+3m